#!python
# Demonstrate python/Tkinter threading bug

import sys, types, os, threading
import Tkinter as TK
from time import sleep


class App:

    def __init__(self, root):

        self.root = root
        self.update_loop()


        # Start a second thread, to do whatever...
        self.thread = threading.Thread(target=self.second_thread)
        self.thread.start()


    def update_loop(self):
        print >>sys.stderr, "*** update_loop"
        self.root.after(400, self.update_loop)


    def second_thread(self):
        sleep(100)


if __name__ == "__main__":
    root = TK.Tk()
    app = App(root)
    root.mainloop();